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Journal of Nanchang University

The Absorption and Dispersion Properties in a Four-level Inverted-Y Atomic System

Jun Zeng

Published Jan 1, 2009• 0 citations
OpenAlex

Abstract

A four-level atomic system in an inverted-Y configuration interacted with three optical fields has been investigated and the properties of absorption and dispersion in different control optical fields have been discussed.The electromagnetic induced transparency would be obtained by choosing proper parameters while the optical nonlinearity of the system would be changed with external fields.The numerical results also show the probe gain via changing phases of Rabi frequency.

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Laser Physics•Jan 7, 2020•2 citations
A four-level atomic system in an inverted-Y configuration interacted with three optical fields has been investigated and the properties of absorption and dispersion in different control optical fields have been discussed.The electromagnetic induced transparency would be obtained by choosing proper parameters while the optical nonlinearity of the system would be changed with external fields.The numerical results also show the probe gain via changing phases of Rabi frequency.
The impact on the absorption-dispersion properties in an Mtype five-level atomic system interacting with external fields system are discussed by using numerical analysis.It is shown that changing the control fields can influence the absorption-dispersion properties regularly.The electromagnetically induce transparency windows can be obtained if the parameters are taken appropriately.The number of transparency windows is proportion to the number of control fields and the width of the transparency windows is related to Rabi frequencies.It is found that the electromagnetically induce transparency windows in the system narrow gradually as decreasing control fields Rabi frequencies while the dispersion of medium would be enhanced and slow-light would be realized.
Using numerical simulation methods,the properties of the absorption and dispersion of probe field in a four-level atomic system with two driving fields are analyzed.Under the condition of resonance,electromagnetically induced transparency(EIT) can appear in this system by adjusting the Rabi frequency of the coherent fields.Furthermore,the phenomenon of performance gain can be obtained by choosing appropriate parameters.Meanwhile,lasing without inversion(LWI) can be explicitly realized in this closed system.
Using density matrix eqution, the absorption and dispersion properties of a A-type four-level system driven by coherent fields are investigated. The result obtained by means of numerical method indicates that by adjusting the intensity of Rabi frequencies of the coherent field in the steady state, three, double or single electromagnetically induced transparency (EIT) can appear explicitly in this system. And the explanations of these phenomena are given by using the dressed states. In the three EIT, the location of transparent windows can be manipulated by controlling the detuning of the driving field. What's more, it is also found that the medium shows a large refractive index at each transparency window, and the group velocity of the probe laser can be enhanced.